JP2746261B2 - DS-CDMA interference cancellation device - Google Patents
DS-CDMA interference cancellation deviceInfo
- Publication number
- JP2746261B2 JP2746261B2 JP14693296A JP14693296A JP2746261B2 JP 2746261 B2 JP2746261 B2 JP 2746261B2 JP 14693296 A JP14693296 A JP 14693296A JP 14693296 A JP14693296 A JP 14693296A JP 2746261 B2 JP2746261 B2 JP 2746261B2
- Authority
- JP
- Japan
- Prior art keywords
- reception
- interference
- user
- reception level
- canceling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/7103—Interference-related aspects the interference being multiple access interference
- H04B1/7107—Subtractive interference cancellation
- H04B1/71072—Successive interference cancellation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Noise Elimination (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、スペクトル直接拡
散符号分割多重（ＤＳ−ＣＤＭＡ）方式における他ユー
ザの干渉キャンセル処理を行うＤＳ−ＣＤＭＡ干渉キャ
ンセル装置に関する。[0001] 1. Field of the Invention [0002] The present invention relates to a DS-CDMA interference canceling apparatus for performing interference cancellation processing of another user in a spectrum direct spread code division multiplexing (DS-CDMA) system.
【０００２】[0002]
【従来の技術】従来、この種のＤＳ−ＣＤＭＡにおける
セル内の干渉キャンセル（低減）方法として、マルチユ
ーザシリアル干渉キャンセル装置が知られている。この
装置では、あるユーザｋ（１≦ｋ≦Ｋ）の信号を復調す
る前にユーザの干渉レプリカ信号を生成し、差し引いて
復調するという処理をＩ回（マルチステージ）行うこと
によって、他ユーザの干渉をキャンセルしている。2. Description of the Related Art Conventionally, as a method of canceling (reducing) intra-cell interference in this kind of DS-CDMA, a multi-user serial interference canceling apparatus is known. In this device, before demodulating a signal of a certain user k (1 ≦ k ≦ K), an interference replica signal of the user is generated, and a process of subtracting and demodulating the signal is performed I times (multi-stage), thereby performing another process (multi-stage). Canceling interference.
【０００３】この場合の処理は、全てのユーザ（１〜
Ｋ）の受信レベルを測定し、その値の大きいユーザから
順に干渉キャンセル処理を行っている。この際、各ユー
ザが移動していると、その受信レベルが変化するため、
この順序が時間とともに入れ替わる可能性がある。そこ
で一定時間ごとに受信レベルを測定し、処理順次を絶え
ず入れ替える必要がある。このため受信レベルランキン
グ制御部によって受信レベルの順位付け（ランク付け）
の計算を行った後に、各干渉キャンセルユニット（ＩＣ
Ｕ）に対し、受信レベルランキングの結果を各ＩＣＵに
通知している。すなわち、各ＩＣＵではどのユーザの干
渉キャンセル処理を行えば良いかを指示している。In this case, the processing is performed for all users (1 to
The reception level of K) is measured, and the interference cancellation processing is performed in order from the user having the larger value. At this time, if each user moves, the reception level changes,
This order may change over time. Therefore, it is necessary to measure the reception level at regular intervals and constantly change the processing order. For this reason, the reception level ranking control unit ranks the reception levels (ranking).
Is calculated, and then each interference cancellation unit (IC
U), the result of the reception level ranking is notified to each ICU. That is, each ICU indicates which user should perform the interference cancellation process.
【０００４】この場合、干渉キャンセルは順送りで処理
されるため現時点で各ＩＣＵにて処理されている受信信
号が過去の何時の時点で受信されたものであるかが、各
ＩＣＵで異なることになる。このため受信レベルランキ
ング制御部では各ＩＣＵが処理している受信信号の受信
時刻を把握し、その時点における受信レベルランキング
結果に応じたユーザの干渉キャンセル処理を行うよう指
示している。このため、過去の受信レベルランキング情
報を保持するメモリを用いるとともに、各ＩＣＵに対す
る適切な処理を指示する制御部が必要となる。この際、
ユーザ数Ｋ、ステージ数Ｉの増加に対応して装置全体を
制御する制御系が設けられることになる。[0004] In this case, since the interference cancellation is processed in order, each ICU differs in what time in the past the received signal being processed by each ICU is received. . For this reason, the reception level ranking control unit grasps the reception time of the reception signal being processed by each ICU, and instructs to perform the interference cancellation processing of the user according to the reception level ranking result at that time. For this reason, it is necessary to use a memory that retains the past reception level ranking information and to provide a control unit that instructs each ICU to perform an appropriate process. On this occasion,
A control system for controlling the entire apparatus in response to increases in the number of users K and the number of stages I is provided.
【０００５】図７は従来のＤＳ−ＣＤＭＡ干渉キャンセ
ル装置の構成を示すブロック図である。図７の装置は、
受信レベル測定ステージ１と、第１ステージ２と、第２
ステージ（干渉キャンセルステージ）３と、第３ステー
ジ４とを有している。さらに、復号信号を出力する最終
復号ステージ５と、ＩＣＵへ受信レベルランキング情報
を通知する受信レベルランキング制御器６とを有してい
る。FIG. 7 is a block diagram showing a configuration of a conventional DS-CDMA interference canceling apparatus. The device of FIG.
Received level measurement stage 1, first stage 2, second stage
A stage (interference cancellation stage) 3 and a third stage 4 are provided. Further, it has a final decoding stage 5 for outputting a decoded signal, and a reception level ranking controller 6 for notifying the ICU of reception level ranking information.
【０００６】受信レベル測定ステージ１は受信信号Ｓ１
が入力される受信機（ＲＸ）１，２，３…ｎを有し、ま
た、第１ステージ２には干渉キャンセルユニット（ＩＣ
Ｕ）１−１，１−２，１−３…１−ｎが設けられてい
る。さらに、第２ステージ（干渉キャンセルステージ）
３はＩＣＵ２−１，２−２，２−３…２−ｎを有し、第
３ステージ４にはＩＣＵ３−１，３−２，３−３…３−
ｎが設けられている。また、最終復号ステージ５には、
ＩＣＵ３−１〜３−ｎからの干渉キャンセル処理した受
信信号が入力されて復号信号を出力するデコーダ１，
２，３…ｎが設けられている。[0006] The reception level measurement stage 1 receives the reception signal S1.
Are input to the first stage 2, and an interference canceling unit (IC)
U) 1-1, 1-2, 1-3... 1-n are provided. Second stage (interference cancellation stage)
3 includes ICUs 2-1, 2-2, 2-3... 2-n, and a third stage 4 includes ICUs 3-1, 3-2, 3-3.
n is provided. In the final decoding stage 5,
Decoders 1, which receive received signals subjected to interference cancellation processing from ICUs 3-1 to 3-n and output decoded signals,
2, 3,... N are provided.
【０００７】次に、この従来例の動作について説明す
る。受信信号Ｓ１が、まず、受信レベル測定ステージ１
の受信機（ＲＸ）１〜ｎに同時に入力され、ここで各ユ
ーザごとの受信レベルが測定される。この測定結果が受
信レベルランキング制御器６に集中して入力される。こ
の受信レベルランキング制御器６ではユーザ（１〜ｎ）
の受信レベルを大きい順に並び替えてｋ（ｔ，ｐ）（ｋ
＝ユーザ、ｔ＝受信された時刻、ｐ＝受信レベル順位）
を求め、この受信レベルランキング情報を、対応する第
１から第３ステージ中のＩＣＵ１−１〜３−ｎに通知す
る。このＩＣＵ３−１〜３−ｎからの干渉キャンセルを
処理した受信信号が最終復号ステージ５のデコーダ１〜
ｎに入力され、ここから復号信号を出力する。Next, the operation of this conventional example will be described. The reception signal S1 is first transmitted to the reception level measurement stage 1
Are simultaneously input to the receivers (RX) 1 to n, where the reception level of each user is measured. This measurement result is intensively input to the reception level ranking controller 6. In the reception level ranking controller 6, the users (1 to n)
Are sorted in descending order of reception level, and k (t, p) (k
= User, t = reception time, p = reception level ranking)
And the received level ranking information is notified to the corresponding ICU1-1 to 3-n in the first to third stages. The reception signals processed by the interference cancellation from the ICUs 3-1 to 3-n are output to the decoders 1 to 3 of the final decoding stage 5.
n from which a decoded signal is output.
【０００８】このように、第１から第３ステージ中の各
ＩＣＵ１−１〜３−ｎが、現在どの時点の受信信号の干
渉キャンセルを処理しているのかを受信レベルランキン
グ制御器６が把握したうえで、それぞれのＩＣＵ１−１
〜３−ｎに対して干渉キャンセルの処理を行うように指
示している。As described above, the reception level ranking controller 6 grasps at what point each of the ICUs 1-1 to 3-n in the first to third stages is currently processing the interference cancellation of the received signal. Above, each ICU1-1
To 3-n to perform interference cancellation processing.
【０００９】このような干渉キャンセル処理を行う例と
して、特開平５−６８０１７号公報の「スペクトラム拡
散受信装置およびスペクトラム拡散送信装置およびスペ
クトラム拡散通信装置」が知られている。この従来例
は、受信信号から干渉検波を行って、その干渉波を検出
し、この検出結果に基づいて干渉波を除去して、拡散復
調を行っている。As an example of performing such an interference canceling process, Japanese Patent Laid-Open Publication No. 5-68017 discloses a "spread spectrum receiving apparatus, a spread spectrum transmitting apparatus, and a spread spectrum communication apparatus". In this conventional example, interference detection is performed from a received signal, the interference wave is detected, and based on the detection result, the interference wave is removed and spread demodulation is performed.
【００１０】[0010]
【発明が解決しようとする課題】このように上記従来例
のうち前者のＤＳ−ＣＤＭＡ干渉キャンセル装置では、
全てのユーザの受信レベルを測定し、受信レベルの大き
いユーザからの順序で干渉キャンセル処理を行っている
ため、各ユーザが移動している場合は各ユーザの受信レ
ベルは絶えず変化し、この順番が時間とともに入れ替わ
ってしまう。このため、一定時間ごとに受信レベルを測
定し直して処理順番を入れ替えなければならない。As described above, in the former DS-CDMA interference canceling apparatus of the above conventional examples,
Since the reception levels of all users are measured and the interference cancellation processing is performed in the order from the user with the highest reception level, when each user is moving, the reception level of each user constantly changes, and this order is changed. It will change over time. For this reason, the reception level must be measured again at regular time intervals to change the processing order.
【００１１】このため、受信レベルランキング制御部で
は、それぞれのＩＣＵで現在処理している受信信号が受
信された時刻を把握し、その時点における受信レベルラ
ンキング結果に応じたユーザの干渉キャンセル処理を行
うよう指示しているため、過去の受信レベルランキング
情報を保持するメモリが必要になり、かつ、各ＩＣＵに
対する適切な干渉キャンセル処理の指示を行う制御部も
必要になる。換言すれば、ユーザ数及びステージ数の増
加に応じて制御が煩雑化し、その構成が複雑化するとい
う欠点があった。また、後者の特開平５−６８０１７号
の例も装置全体の制御が複雑であり、改善の余地があ
る。[0011] For this reason, the reception level ranking control unit grasps the time at which the reception signal currently being processed by each ICU is received, and performs a user interference cancellation process according to the reception level ranking result at that time. Therefore, a memory for retaining past reception level ranking information is required, and a control unit for instructing each ICU to perform an appropriate interference cancellation process is also required. In other words, there is a disadvantage that the control becomes complicated as the number of users and the number of stages increase, and the configuration becomes complicated. Also, in the latter example of JP-A-5-68017, the control of the entire apparatus is complicated, and there is room for improvement.
【００１２】本発明は、このような従来の技術における
課題を解決するものであり、干渉キャンセルユニットの
集中制御が不要になり、また、受信レベルのランク付け
の計算を行う受信レベルランキング制御器を不要にし
て、その信号処理規模及び装置構成を簡略化できるＤＳ
−ＣＤＭＡ干渉キャンセル装置の提供を目的とする。The present invention solves such a problem in the prior art, and eliminates the need for centralized control of an interference canceling unit. In addition, the present invention provides a reception level ranking controller for calculating the ranking of reception levels. DS that can be unnecessary and simplify its signal processing scale and device configuration
-To provide a CDMA interference cancellation apparatus.
【００１３】[0013]
【課題を解決するための手段】上記課題を達成するため
に、請求項１記載の発明は、スペクトル直接拡散符号分
割多重方式における他ユーザの干渉をキャンセルするＤ
Ｓ−ＣＤＭＡ干渉キャンセル装置にあって、全ユーザの
受信信号の受信レベルを測定する並列接続の受信レベル
測定手段と、受信レベル測定手段で測定された各ユーザ
の受信レベルを集計し、受信レベルの大きい順に並べ替
えて順位付けを行う並べ替え順位付け手段と並べ替え順
位付け手段での順位付け情報を受信信号ブロックに添付
する添付手段と、添付手段からの受信信号ブロックにお
ける順位付け情報に基づいて自己がどのユーザーの処理
をすれば良いかを判別して干渉キャンセル処理を行う直
列接続の複数の干渉キャンセルユニットとを備える構成
としてある。In order to achieve the above object, the invention according to claim 1 provides a method for canceling interference of another user in a direct spread spectrum code division multiplexing system.
In the S-CDMA interference canceling apparatus, the parallel connection reception level measuring means for measuring the reception levels of the reception signals of all users, and the reception levels of the respective users measured by the reception level measurement means are totaled, and Sorting ordering means for sorting and ranking in descending order, attaching means for attaching the ranking information in the sorting ordering means to the received signal block, and based on the ranking information in the received signal block from the attaching means. It is configured to include a plurality of series-connected interference cancellation units that determine which user should perform processing and perform interference cancellation processing.
【００１４】請求項２記載の発明はスペクトル直接拡散
符号分割多重方式における他ユーザの干渉をキャンセル
するＤＳ−ＣＤＭＡ干渉キャンセル装置にあって、全ユ
ーザの受信信号の受信レベルを測定し、かつ、受信レベ
ル情報を受信信号ブロックに添付して次段に出力する直
列接続の受信レベル測定手段と、受信レベル測定手段か
らの受信信号ブロックにおける各ユーザの受信レベル情
報から受信レベルの大きい順に並べ替える順位付けを行
い、自己がどのユーザーの処理をすれば良いかを判別し
て干渉キャンセル処理を行う直列接続の複数の干渉キャ
ンセルユニットとを備える構成としてある。According to a second aspect of the present invention, there is provided a DS-CDMA interference canceling apparatus for canceling interference of other users in the direct spread spectrum code division multiplexing system. A serially connected reception level measuring means for attaching the level information to the reception signal block and outputting it to the next stage; and a ranking for rearranging the reception level information of each user in the reception signal block from the reception level measurement means in descending order of the reception level. And a plurality of serially connected interference cancellation units that determine which user should perform the processing and perform the interference cancellation processing.
【００１５】請求項３記載のＤＳ−ＣＤＭＡ干渉キャン
セル装置は、干渉キャンセルユニットが出力する干渉を
キャンセル処理した受信信号に対する復号処理を行う複
数の復号手段を備える構成としてある。[0015] The DS-CDMA interference cancel apparatus according to claim 3 is configured to include a plurality of decoding means for performing a decoding process on a received signal which has been subjected to an interference canceling process output by the interference canceling unit.
【００１６】このような構成の請求項１，３記載のＤＳ
−ＣＤＭＡ干渉キャンセル装置は、全ユーザの受信信号
の受信レベルを同時に測定して受信レベルの大きい順に
並べ替えを行い、この順位付け情報（受信信号レベルラ
ンキング情報）を受信信号ブロックに添付して干渉キャ
ンセルユニットに出力し、ここで後段に順送りして出力
される。各干渉キャンセルユニットは、添付された受信
信号レベルランキング情報に基づいて、自己がいずれの
ユーザの干渉キャンセル処理を行なうのかを判別して、
その処理を行い、この後に復号処理を行う。したがっ
て、従来例のような干渉キャンセルユニットの集中制御
が不要になり、さらに過去の受信レベルランキング情報
の保持を行うメモリなども不要になり、その信号処理規
模が縮小される。The DS according to claim 1 or 3 having such a configuration.
-The CDMA interference cancellation apparatus measures the reception levels of the reception signals of all users at the same time, sorts them in descending order of the reception levels, and attaches this ranking information (reception signal level ranking information) to the reception signal block to cause interference. The data is output to the cancel unit, where it is sequentially forwarded and output. Each interference canceling unit, based on the attached received signal level ranking information, determines which user performs the interference canceling process of which user,
This processing is performed, and then the decoding processing is performed. This eliminates the need for centralized control of the interference cancellation unit as in the conventional example, and further eliminates the need for a memory or the like for holding past reception level ranking information, thereby reducing the signal processing scale.
【００１７】請求項２，３記載のＤＳ−ＣＤＭＡ干渉キ
ャンセル装置は、直列接続の受信レベル測定手段が、全
ユーザの受信信号の受信レベルを測定し、かつ、受信レ
ベル情報を受信信号ブロックに添付して順送りして次段
に出力する。この順位付け情報（受信信号レベルランキ
ング情報）を添付した受信信号ブロックが干渉キャンセ
ルユニットで順送りされ、ここで添付されたランキング
情報に基づいて、自己がいずれのユーザの干渉キャンセ
ル処理を行なうのかを判別して、その処理を行い、この
後に復号処理を行っている。したがって、従来例のよう
に受信レベルのランク付けの計算を行う受信レベルラン
キング制御器が不要になり、その装置構成が簡略化され
る。According to a second aspect of the present invention, in the DS-CDMA interference canceling apparatus, the serially connected reception level measuring means measures the reception levels of the reception signals of all users and attaches the reception level information to the reception signal block. And forward to output to the next stage. The reception signal block to which the ranking information (reception signal level ranking information) is attached is sequentially sent by the interference cancellation unit, and it is determined which user performs the interference cancellation processing of the user based on the attached ranking information. Then, the decoding process is performed. Therefore, a receiving level ranking controller for calculating the ranking of the receiving level as in the conventional example is not required, and the configuration of the apparatus is simplified.
【００１８】[0018]
【発明の実施の形態】次に、本発明のＤＳ−ＣＤＭＡ干
渉キャンセル装置の実施の形態を図面を参照して詳細に
説明する。図１は本発明のＤＳ−ＣＤＭＡ干渉キャンセ
ル装置の実施形態における構成を示すブロック図であ
る。図１の装置は、受信信号Ｓ１をブロック単位に区分
して、それぞれの受信レベルを測定する受信レベル測定
ステージ１１を有している。さらに、各ブロックごとの
干渉キャンセル処理を行う干渉キャンセルステージ１３
を有している。さらに、復号信号を出力する最終復号ス
テージ１６と、ＩＣＵへ受信レベルランキング情報を通
知する受信レベルランキング制御器１８を有している。Next, an embodiment of a DS-CDMA interference canceling apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a DS-CDMA interference cancellation apparatus according to an embodiment of the present invention. The apparatus shown in FIG. 1 has a reception level measurement stage 11 that divides the reception signal S1 into blocks and measures each reception level. Further, an interference cancellation stage 13 for performing an interference cancellation process for each block
have. Further, it has a final decoding stage 16 for outputting a decoded signal, and a reception level ranking controller 18 for notifying the ICU of reception level ranking information.
【００１９】受信レベル測定ステージ１１は受信信号Ｓ
１が入力される受信機（ＲＸ）２１，２２，２３…２ｎ
を有し、また、干渉キャンセルステージ１３はＩＣＵ１
３−１，１３−２，１３−３，１３−４，１３−５，１
３−６，１３−７，１３−８，１３−９，１４−１，１
４−２…１４−ｎを有している。また、最終復号ステー
ジ１６には、ＩＣＵ１３−１〜１４−ｎからの干渉をキ
ャンセルした受信信号が入力されて復号信号を出力する
デコーダ１６−１，１６−２，１６−３…１６−ｎが設
けられている。The reception level measurement stage 11 receives the reception signal S
Receivers (RX) 21, 22, 23... 2n to which 1 is input
And the interference cancellation stage 13 is ICU1
3-1, 13-2, 13-3, 13-4, 13-5, 1
3-6, 13-7, 13-8, 13-9, 14-1, 1
4-2... 14-n. The final decoding stage 16 includes decoders 16-1, 16-2, 16-3,..., 16-n that receive the received signals from which interference from the ICUs 13-1 to 14-n has been input and output decoded signals. Is provided.
【００２０】受信レベルランキング制御器１８には、入
力される受信信号Ｓ１をブロック単位に区分けして出力
する受信信号ブロック化部１８ａと、受信レベルの順位
付け（ランキング添付）を行うランキング情報添付部１
８ｂと、受信信号Ｓ１の受信レベルのランキングを計算
する受信レベルランキング計算部１８ｃとが設けられて
いる。The reception level ranking controller 18 includes a reception signal blocking section 18a for dividing the input reception signal S1 into blocks and outputting the received signal S1, and a ranking information attachment section for ranking reception levels (attaching ranking). 1
8b and a reception level ranking calculation unit 18c that calculates the ranking of the reception level of the reception signal S1.
【００２１】次に、この第１実施形態の動作について説
明する。受信信号Ｓ１が受信レベル測定ステージ１１中
の受信機（ＲＸ）２１〜２ｎに入力され、ここで受信信
号ブロックごとに各ユーザの受信信号レベルが測定され
る。この測定結果が受信レベルランキング制御器１８中
の受信レベルランキング計算部１８ｃに入力され、ここ
で受信レベルのランキングが計算される。Next, the operation of the first embodiment will be described. The reception signal S1 is input to the receivers (RX) 21 to 2n in the reception level measurement stage 11, where the reception signal level of each user is measured for each reception signal block. This measurement result is input to the reception level ranking calculation unit 18c in the reception level ranking controller 18, where the ranking of the reception level is calculated.
【００２２】また、受信信号Ｓ１が受信レベルランキン
グ制御器１８中の受信信号ブロック化部１８ａに入力さ
れ、ここでブロック化され、さらに、ランキング情報添
付部１８ｂで受信レベルランキング計算部１８ｃから入
力された受信レベルの順位付け（ランキング添付）が行
われる。ランキング情報添付部１８ｂからの受信レベル
ランキング情報が添付された受信信号ブロックが干渉キ
ャンセルステージ１３のＩＣＵ１３−１に入力される。The received signal S1 is input to a received signal blocking section 18a in the received level ranking controller 18, where it is blocked, and further input from a received level ranking calculating section 18c in a ranking information attaching section 18b. The received levels are ranked (attached to the ranking). The reception signal block to which the reception level ranking information from the ranking information attachment unit 18b is attached is input to the ICU 13-1 of the interference cancellation stage 13.
【００２３】図２は受信信号ブロックに添付される受信
レベルランキング情報例を示す図である。図２の例は、
受信信号レベルの大きい順にユーザ番号が格納されてい
る。すなわち、受信レベルランキング情報として受信レ
ベル順位１のユーザ番号、受信レベル順位２のユーザ番
号、受信レベル順位３のユーザ番号…受信レベル順位Ｋ
（ｎ）−１、受信レベル順位Ｋ（ｎ）が格納され、この
後に全ユーザ（Ｋ）分の受信信号データが配置されてい
る。FIG. 2 is a diagram showing an example of reception level ranking information attached to a reception signal block. The example in FIG.
User numbers are stored in descending order of the received signal level. That is, as the reception level ranking information, the user number of the reception level rank 1, the user number of the reception level rank 2, the user number of the reception level rank 3 ... the reception level rank K
(N) -1, the reception level order K (n) is stored, and thereafter, reception signal data for all users (K) is arranged.
【００２４】干渉キャンセルステージ１３のＩＣＵ１３
−１〜１４−ｎでは、ランキング情報添付部１８ｂから
の受信信号ブロックに添付された各ユーザの受信レベル
ランキング情報を参照して、自己ＩＣＵ（１３−１〜１
４−ｎ）が、いずれのユーザの受信信号の干渉キャンセ
ル処理を行うかを判断する。ICU 13 of interference cancellation stage 13
-1 to 14-n refer to the reception level ranking information of each user attached to the reception signal block from the ranking information attachment unit 18b and refer to the own ICU (13-1 to 1--1).
4-n) determines which user's received signal performs interference cancellation processing.
【００２５】図３は、受信レベルランキング情報を添付
した受信信号ブロック例を示す図である。図３の受信信
号ブロックを、例えば、ＩＣＵ１３−３が受け取った場
合に、このＩＣＵ１３−３は３番目に受信レベルが大き
いユーザの干渉キャンセル処理を行えば良いことにな
る。すなわち、添付された受信レベルランキング情報の
３番目に表示されたユーザ１３の干渉キャンセル処理を
行う。FIG. 3 is a diagram showing an example of a reception signal block to which reception level ranking information is attached. For example, when the ICU 13-3 receives the received signal block of FIG. 3, the ICU 13-3 only needs to perform the interference cancellation processing of the user having the third highest reception level. That is, interference cancellation processing of the user 13 displayed third in the attached reception level ranking information is performed.
【００２６】このようにしてＩＣＵ１３−１〜１４−ｎ
が、それぞれ対応するユーザの干渉キャンセル処理を行
い、最終復号ステージ１６のデコーダ１６−１〜１６−
ｎが復号信号を出力する。Thus, the ICUs 13-1 to 14-n
Perform the interference cancellation processing of the corresponding user, and perform the decoders 16-1 to 16-
n outputs the decoded signal.
【００２７】以上のように第１実施形態では、受信信号
レベルランキング情報を添付した受信信号ブロックをＩ
ＣＵ１３−１〜１４−ｎに送出し、ここで添付された受
信レベルランキング情報に基づいて、自己がいずれのユ
ーザの干渉キャンセル処理を行なうのかを判別して、そ
の干渉キャンセル処理後に復号処理を行っている。これ
によって、従来例のような干渉キャンセルユニットの集
中制御が不要になり、さらに過去の受信レベルランキン
グ情報を保持するためのメモリなども不要になり、その
信号処理規模が縮小される。As described above, in the first embodiment, the reception signal block to which the reception signal level ranking information is attached is
CUs 13-1 to 14-n are transmitted, and based on the reception level ranking information attached thereto, it is determined which user performs interference cancellation processing of the user, and decoding processing is performed after the interference cancellation processing. ing. This eliminates the need for centralized control of the interference cancellation unit as in the conventional example, and further eliminates the need for a memory or the like for retaining past reception level ranking information, thereby reducing the signal processing scale.
【００２８】図４は第２実施形態の構成を示すブロック
図である。図４の例は、受信信号Ｓ１をブロック単位に
区分して、それぞれの受信レベルを測定する受信レベル
測定ステージ３１と、各ブロックごとの干渉キャンセル
処理を行う干渉キャンセルステージ３２と、さらに、復
号信号を出力する最終復号ステージ３３とを有してい
る。FIG. 4 is a block diagram showing the configuration of the second embodiment. In the example of FIG. 4, the reception signal S1 is divided into blocks, and a reception level measurement stage 31 that measures each reception level, an interference cancellation stage 32 that performs an interference cancellation process for each block, and a decoded signal And a final decoding stage 33 that outputs
【００２９】受信レベル測定ステージ３１は受信信号Ｓ
１が入力される並列接続の受信機（ＲＸ）４１，４２，
４３…４ｎを有し、また、干渉キャンセルステージ３２
は、直列接続のＩＣＵ３２−１，３２−２，３２−３，
３２−４，３２−５，３２−６，３２−７，３２−８，
３２−９，３３−１，３３−２…３３−ｎを有してい
る。また、最終復号ステージ３３には、ＩＣＵ３２−１
〜３３−ｎからの干渉をキャンセルした受信信号が入力
されて復号信号を出力するデコーダ３３−１，３３−
２，３３−３…３３−ｎが設けられている。The reception level measurement stage 31 receives the reception signal S
1 are input to the parallel-connected receivers (RX) 41, 42,
43 ... 4n, and the interference cancel stage 32
Are the ICUs 32-1, 32-2, 32-3,
32-4, 32-5, 32-6, 32-7, 32-8,
32-9, 33-1, 33-2... 33-n. The final decoding stage 33 includes the ICU 32-1
Decoders 33-1 and 33- that receive a received signal from which interference from.
2, 33-3... 33-n are provided.
【００３０】受信レベル測定ステージ３１の受信機（Ｒ
Ｘ）４１〜４ｎは、それぞれ各ユーザごとの受信レベル
を測定したブロック単位での受信レベル情報を添付し
て、次段に順送りする直列接続の構成となっている。ま
た、干渉キャンセルステージ３２のＩＣＵ３２−１〜３
３−ｎは、受信信号ブロックに添付された各ユーザの受
信レベル情報から、その受信レベルを判定する。そし
て、その処理ユーザを決定し、干渉キャンセル処理を行
って次段に順送りする直列接続の構成となっている。The receiver (R) of the reception level measurement stage 31
X) 41 to 4n each have a serial connection configuration in which reception level information in units of blocks in which the reception level of each user is measured is attached and the data is forwarded to the next stage. Also, ICUs 32-1 to 32-3 of the interference cancel stage 32
3-n determines the reception level from the reception level information of each user attached to the reception signal block. Then, the processing user is determined, the interference cancellation processing is performed, and the data is forwarded to the next stage in a serial connection configuration.
【００３１】次に、第２実施形態の動作について説明す
る。図４において、受信信号Ｓ１が受信レベル測定ステ
ージ３１の受信機（ＲＸ）４１に入力され、ここから受
信機４ｎへ順送りで出力され、各ユーザごとの受信レベ
ルを測定する。この受信レベル情報を添付した受信信号
ブロックを順送りで次段の受信機（４２〜４ｎ）に出力
し、最後に受信機４ｎから干渉キャンセルステージ３２
のＩＣＵ３２−１へ受信レベル情報を添付した受信信号
ブロックを出力する。Next, the operation of the second embodiment will be described. In FIG. 4, a reception signal S1 is input to a receiver (RX) 41 of a reception level measurement stage 31, and is sequentially output to a receiver 4n to measure a reception level for each user. The reception signal block to which the reception level information is attached is sequentially output to the next-stage receivers (42 to 4n).
And outputs a reception signal block to which the reception level information is attached to the ICU 32-1.
【００３２】図５は受信信号ブロックに添付された受信
レベル情報例を示す図である。図５において、ユーザ番
号１，２，３…Ｋ（ｎ）−１，Ｋ（ｎ）順に受信信号レ
ベルが格納され、この後に全ユーザ（Ｋ）分の受信信号
データが格納されている。FIG. 5 is a diagram showing an example of reception level information attached to a reception signal block. In FIG. 5, received signal levels are stored in the order of user numbers 1, 2, 3,..., K (n) -1, K (n), followed by received signal data for all users (K).
【００３３】干渉キャンセルステージ３２では、ＩＣＵ
３２−１〜３３−ｎが、受信ブロックに添付された各ユ
ーザの受信レベル情報から受信レベルを判定し、その処
理ユーザを決定し、次に干渉キャンセル処理を行う。す
なわち、受信信号ブロックに添付された各ユーザの受信
レベル情報を参照し、受信レベルの大きい順に並べ替え
ることによって自分がどのユーザの受信信号の干渉キャ
ンセル処理すれば良いかを判断して、その干渉キャンセ
ル処理を行う。In the interference cancellation stage 32, the ICU
32-1 to 33-n determine the reception level from the reception level information of each user attached to the reception block, determine the processing user, and then perform the interference cancellation processing. That is, by referring to the reception level information of each user attached to the reception signal block and rearranging the reception level information in descending order of the reception level, it is possible to determine which user's reception signal should be subjected to interference cancellation processing, and determine the interference. Perform cancellation processing.
【００３４】図６は受信レベル情報を添付した受信信号
ブロック例を示す図である。図６において、受信信号ブ
ロックのユーザ１，２，３…Ｋ（ｎ）−１，Ｋ（ｎ）順
に受信信号レベル９．０，９．３，８．９…９．２，
９．５が格納されている。例えば、受信信号ブロックを
ＩＣＵ３２−３が受け取った際に、ＩＣＵ３２−３は、
まず、受信信号ブロックに添付されたユーザ１〜Ｋまで
の受信レベルを大きい順に並び替える。ここでは、受信
レベル「９．３」が３番目に大きい受信信号であり、そ
の「９．３」の受信レベルのユーザ、すなわち、ここで
はユーザ２の干渉キャンセル処理を行う。FIG. 6 is a diagram showing an example of a reception signal block to which reception level information is attached. In FIG. 6, received signal levels 9.0, 9.3, 8.9... 9.2 in the order of users 1, 2, 3... K (n) -1, K (n) of received signal blocks.
9.5 are stored. For example, when the ICU 32-3 receives the received signal block,
First, the reception levels of the users 1 to K attached to the reception signal blocks are rearranged in descending order. Here, the reception level “9.3” is the third largest received signal, and the user of the reception level “9.3”, that is, user 2 here, performs the interference cancellation processing.
【００３５】このようにしてＩＣＵ３２−１〜３３−ｎ
が、対応するユーザの干渉キャンセル処理を行い、最終
復号ステージ３３のデコーダ３３−１〜３３−ｎから復
号信号を出力する。Thus, the ICUs 32-1 to 33-n
Performs the interference cancellation processing of the corresponding user, and outputs decoded signals from the decoders 33-1 to 33-n of the final decoding stage 33.
【００３６】以上のように、この第２実施形態では、受
信信号ブロックに受信信号レベル情報が添付され、ＩＣ
Ｕ３２−２〜３３−ｎへ順送りで出力される。ここで添
付された受信信号レベル情報に基づいて、自己がいずれ
のユーザの干渉キャンセル処理を行なうのかを判別し、
この後に復号処理を行う。この結果、従来、必要であっ
た受信レベルのランク付けの計算を行うランキング制御
器が不要になり、その装置構成が簡略化される。As described above, in the second embodiment, the received signal level information is attached to the received signal block,
U32-2 to 33-n are sequentially output. Based on the received signal level information attached here, it is determined which user performs the interference cancellation process of which user,
Thereafter, the decryption processing is performed. As a result, a ranking controller for performing the calculation of the ranking of the reception level, which is conventionally required, is not required, and the apparatus configuration is simplified.
【００３７】[0037]
【発明の効果】以上の説明から明らかなように、請求項
１，３記載のＤＳ−ＣＤＭＡ干渉キャンセル装置によれ
ば、全ユーザの受信信号の受信レベルを同時に測定して
受信レベルの大きい順に並べ替えた順位付け情報（受信
信号レベルランキング情報）に基づいて干渉キャンセル
ユニットが、自己がいずれのユーザの干渉キャンセル処
理を行なうのかを判別して、その干渉キャンセル処理を
行っているため、従来例をもって説明したような干渉キ
ャンセルユニットの集中制御が不要になり、さらに過去
の受信レベルランキング情報の保持を行うメモリなども
不要になり、その信号処理規模を縮小できるようにな
る。As is apparent from the above description, according to the DS-CDMA interference canceling apparatus of the first and third aspects, the reception levels of the reception signals of all the users are simultaneously measured and arranged in descending order of the reception levels. The interference canceling unit determines which user performs the interference canceling process based on the changed ranking information (received signal level ranking information), and performs the interference canceling process. The centralized control of the interference canceling unit as described above becomes unnecessary, and a memory for holding the past reception level ranking information becomes unnecessary, and the signal processing scale can be reduced.
【００３８】請求項２，３記載のＤＳ−ＣＤＭＡ干渉キ
ャンセル装置は、全ユーザの受信信号の受信レベルを測
定した受信レベル情報に基づいて、干渉キャンセルユニ
ットが、いずれのユーザの干渉キャンセル処理を行なう
のかを判別して、その干渉キャンセル処理を行っている
ため、従来例のように受信レベルのランク付けの計算を
行う受信レベルランキング制御器が不要になり、その装
置構成を簡略化できるようになる。In the DS-CDMA interference canceling apparatus according to the second and third aspects, the interference canceling unit performs the interference canceling process of any user based on the reception level information obtained by measuring the reception levels of the reception signals of all users. Is determined and the interference cancellation process is performed, so that the reception level ranking controller for calculating the ranking of the reception level as in the conventional example becomes unnecessary, and the apparatus configuration can be simplified. .
【図１】本発明のＤＳ−ＣＤＭＡ干渉キャンセル装置の
実施形態における構成を示すブロック図である。FIG. 1 is a block diagram illustrating a configuration of a DS-CDMA interference cancellation apparatus according to an embodiment of the present invention.
【図２】第１実施形態にあって受信信号ブロックに添付
されるランキング情報例を示す図である。FIG. 2 is a diagram illustrating an example of ranking information attached to a received signal block in the first embodiment.
【図３】第１実施形態にあって受信レベルランキング情
報を添付した受信信号ブロック例を示す図である。FIG. 3 is a diagram illustrating an example of a reception signal block to which reception level ranking information is attached in the first embodiment.
【図４】第２実施形態の構成を示すブロック図である。FIG. 4 is a block diagram illustrating a configuration of a second embodiment.
【図５】第２実施形態にあって受信信号ブロックに添付
された受信レベル情報例を示す図である。FIG. 5 is a diagram illustrating an example of reception level information attached to a reception signal block in the second embodiment.
【図６】第２実施形態にあって受信レベル情報を添付し
た受信信号ブロック例を示す図である。FIG. 6 is a diagram illustrating an example of a reception signal block to which reception level information is attached in the second embodiment.
【図７】従来のＤＳ−ＣＤＭＡ干渉キャンセル装置の構
成を示すブロック図である。FIG. 7 is a block diagram illustrating a configuration of a conventional DS-CDMA interference cancellation apparatus.
１１，３１ 受信レベル測定ステージ １３，３２ 干渉キャンセルステージ（ＩＣＵ） １３−１〜１４−ｎ，３２−１〜３３−ｎ ＩＣＵ １６，３３ 最終復号ステージ １６−１〜１６−ｎ，３３−１〜３３−ｎ デコーダ １８ 受信信号レベルランキング制御器 １８ａ 受信信号ブロック化部 １８ｂ ランキング情報添付部 １８ｃ 受信レベルランキング計算部 ２１〜２ｎ，４１〜４ｎ 受信機 Ｓ１ 受信信号 11, 31 Received level measurement stage 13, 32 Interference cancellation stage (ICU) 13-1 to 14-n, 32-1 to 33-n ICU 16, 33 Final decoding stage 16-1 to 16-n, 33-1 to 3 33-n decoder 18 Received signal level ranking controller 18a Received signal blocking unit 18b Ranking information attachment unit 18c Received level ranking calculation unit 21-2n, 41-4n Receiver S1 Received signal
Claims (3)
おける他ユーザの干渉をキャンセルするＤＳ−ＣＤＭＡ
干渉キャンセル装置にあって、 全ユーザの受信信号の受信レベルを測定する並列接続の
受信レベル測定手段と、前記受信レベル測定手段で測定
された各ユーザの受信レベルを集計し、受信レベルの大
きい順に並べ替えて順位付けを行う並べ替え順位付け手
段と、 前記並べ替え順位付け手段での順位付け情報を受信信号
ブロックに添付する添付手段と、 前記添付手段からの受信信号ブロックにおける順位付け
情報に基づいて自己がどのユーザーの処理をすれば良い
かを判別して干渉キャンセル処理を行う直列接続の複数
の干渉キャンセルユニットと、 を備えることを特徴とするＤＳ−ＣＤＭＡ干渉キャンセ
ル装置。1. DS-CDMA for canceling interference of another user in a direct spread spectrum code division multiplexing system
In the interference canceling apparatus, the parallel-connected reception level measuring means for measuring the reception levels of the reception signals of all users, and the reception levels of the respective users measured by the reception level measurement means are totaled, and the reception levels are arranged in descending order. Rearranging ordering means for rearranging and ranking, attaching means for attaching the ranking information in the sorting ordering means to a received signal block, and based on the ranking information in the received signal block from the attaching means. And a plurality of serially connected interference canceling units for performing the interference canceling process by determining which user should perform the processing by the DS-CDMA interference canceling apparatus.
おける他ユーザの干渉をキャンセルするＤＳ−ＣＤＭＡ
干渉キャンセル装置にあって、 全ユーザの受信信号の受信レベルを測定し、かつ、受信
レベル情報を受信信号ブロックに添付して次段に出力す
る直列接続の受信レベル測定手段と、 前記受信レベル測定手段からの受信信号ブロックにおけ
る各ユーザの受信レベル情報から受信レベルの大きい順
に並べ替える順位付けを行い、自己がどのユーザーの処
理をすれば良いかを判別して干渉キャンセル処理を行う
直列接続の複数の干渉キャンセルユニットと、 を備えることを特徴とするＤＳ−ＣＤＭＡ干渉キャンセ
ル装置。2. DS-CDMA for canceling interference of another user in a direct spread spectrum code division multiplexing system.
In the interference canceling device, a serially-connected reception level measuring means for measuring the reception levels of the reception signals of all users and attaching the reception level information to a reception signal block and outputting to a next stage; A plurality of serial connections in which a user performs the interference canceling process by determining the order in which the user should perform the processing by rearranging the received signals from the means in the received signal block from the means in accordance with the received level information of each user in descending order of the received level. And a DS-CDMA interference cancellation apparatus.
Ａ干渉キャンセル装置において、 干渉キャンセルユニットが出力する干渉をキャンセル処
理した受信信号に対する復号処理を行う複数の復号手段
を備えることを特徴とするＤＳ−ＣＤＭＡ干渉キャンセ
ル装置。3. The DS-CDM according to claim 1, wherein
A DS-CDMA interference canceling apparatus, comprising: a plurality of decoding means for performing a decoding process on a received signal obtained by canceling interference output from an interference canceling unit.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14693296A JP2746261B2 (en) | 1996-06-10 | 1996-06-10 | DS-CDMA interference cancellation device |
| EP19970303996 EP0813314B1 (en) | 1996-06-10 | 1997-06-09 | Direct-sequence code division multiple access receiver |
| KR1019970024789A KR100248454B1 (en) | 1996-06-10 | 1997-06-10 | Ds-cdma receiver with multi-stage serial interference cancellers using power level information appended to data blocks |
| US08/872,604 US5953369A (en) | 1996-06-10 | 1997-06-10 | DS-CDMA receiver with multi-stage serial interference cancelers using power level information appended to data blocks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14693296A JP2746261B2 (en) | 1996-06-10 | 1996-06-10 | DS-CDMA interference cancellation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09331274A JPH09331274A (en) | 1997-12-22 |
| JP2746261B2 true JP2746261B2 (en) | 1998-05-06 |
Family
ID=15418840
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14693296A Expired - Fee Related JP2746261B2 (en) | 1996-06-10 | 1996-06-10 | DS-CDMA interference cancellation device |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5953369A (en) |
| EP (1) | EP0813314B1 (en) |
| JP (1) | JP2746261B2 (en) |
| KR (1) | KR100248454B1 (en) |
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-
1996
- 1996-06-10 JP JP14693296A patent/JP2746261B2/en not_active Expired - Fee Related
-
1997
- 1997-06-09 EP EP19970303996 patent/EP0813314B1/en not_active Expired - Lifetime
- 1997-06-10 US US08/872,604 patent/US5953369A/en not_active Expired - Fee Related
- 1997-06-10 KR KR1019970024789A patent/KR100248454B1/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6480482B1 (en) | 1998-08-28 | 2002-11-12 | Nec Corporation | Multi-user interference cancellor with small sized circuits and little quantity of calculation |
| US6553058B1 (en) | 1999-09-11 | 2003-04-22 | Nec Corporation | Multi-user parallel interface canceler apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0813314B1 (en) | 2005-09-21 |
| KR980007022A (en) | 1998-03-30 |
| EP0813314A3 (en) | 1998-11-18 |
| US5953369A (en) | 1999-09-14 |
| JPH09331274A (en) | 1997-12-22 |
| KR100248454B1 (en) | 2000-03-15 |
| EP0813314A2 (en) | 1997-12-17 |
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